Most AQI APIs are either global with poor India coverage, or India-specific and expensive.
Antrolope is a free real-time air quality API that works worldwide with best-in-class coverage for Indian cities. One call returns AQI, PM2.5, PM10, category, and a safe/caution/avoid verdict. There's also a /pattern endpoint that finds the optimal time window to go outside, currently optimized for Indian cities.
Free API key in 30 seconds at antrolope.com.
